Determination of the rain erosivity factor for the district of Marudá (PA)
DOI:
https://doi.org/10.6008/CBPC2318-2881.2020.004.0007Keywords:
Erosive potential, USLE, PlanningAbstract
In 1965, the USLE (Universal Soil Loss Equation) model was created, which aims to predict the erosion that will occur in a given area, serving as a method to assist in decision making on soil use and management. The model lists six factors, among them that of rain erosivity (R), which has been the most used for the analysis of water erosion, precisely because it collaborates in projects for more efficient sizing of hydraulic works. Thus, the objective was to estimate the value of the Factor R for Marudá (PA) making the data serve as a basis for the nearby municipalities, given the scarcity of more up-to-date information. The period from 1994 to 2019 was used, and the return period and the probability of erosive rains were also calculated. The monthly rainfall erosivity was quite variable, with values ranging from 11.97 a 391.77 MJ mm ha-1 h-1 month-1. Annual erosivity ranged from 1,169.95 (in 1998) to 2,481.17 MJ mm ha-1 h-1 year-1 (in 2009). The value of the R Factor for Marudá is 1,831.92 MJ mm ha-1 h-1 year-1. The highest annual value had an estimated payback period of 27 years with a probability of 3.7%. All information obtained in the study can be used safely for nearby locations and with similar climatic characteristics, which extends the possibility of using the Universal Soil Loss Equation in planning both agricultural and urban activities.
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